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| Number | Title | Issue Date |
| 7089958 | Damper vane A damper unit for an air circulation system. The damper unit includes a frame defining an air flow opening, a damper vane for opening and closing the air flow opening, and a drive mechanism for turning the damper vane between the open and closed positions. The vane ... | 08/15/2006 |
| 7011292 | Bi-leaved valve apparatus Bi-leaved valve apparatus for controlling bulk material flow from a bulk material metering apparatus. A bi-leaved valve apparatus comprises a cylindrical flow tube defining an axial material passageway, an outlet and a flow tube actuation surface. A valve support is... | 03/14/2006 |
| 6568417 | Throttle valve assembly A throttle valve assembly for a deposition chamber or the like is disclosed. The throttle valve assembly comprises a shaft including a first portion and second portion. At least one throttle vane or plate is coupled to the first portion of the shaft and a... | 05/27/2003 |
| 6564819 | Fluid flow control damper assembly A fluid flow control damper assembly having a damper vane and a piston actuator is relatively easy to install when the outer surface of a duct is inaccessible. The piston actuator includes a powder metal piston, lacking an elastomeric (for example, rubber... | 05/20/2003 |
| 6557826 | Low leakage butterfly damper An improved butterfly damper for air delivery systems, having multiple rotatable blades, and a centrally located blade rotating, or actuation means. Each blade comprises an offset, or displaced portion to allow concealment of the actuation mechanism upon ... | 05/06/2003 |
| 6499310 | Flow control device for a gas stream An airflow control device for air streams in a motor vehicle air-conditioning system includes an installation frame with pivotable lamellae (2) that are driven by an electric motor via a gear mechanism arranged on the outside of the frame. The gear mechan... | 12/31/2002 |
| 6418964 | Bearing-supported damper assembly A damper system has a frame within which a plurality of pivotally supported vanes are actuated by linkage rods pivotally connected to the vanes by rocker brackets and trunion pivots. The trunion pivots include bearing assemblies seated within bearing-rece... | 07/16/2002 |
| 5944506 | Burner assembly with tight shut-off opposed louver air damper An opposed louver air damper apparatus for controlling the flow rate of combustion air to a burner fire box, comprising a plurality of adjacent, rotatable louvers having rubber tips and side gaskets providing sealing between the louvers and a frame, and g... | 08/31/1999 |
| 5842919 | Damper actuator assembly An actuator assembly for a multi-blade damper includes a base plate having slots extending longitudinally thereof and slidably receiving drive portions of the louver shafts. A series of drive slots extending generally perpendicular to the clearance slots ... | 12/01/1998 |
| 5765592 | Valve A valve body having a circular throat and three vanes mounted for rotation within the circular throat of the valve body. The three vanes comprise two outlying vanes, each having two opposed circular peripheral edges configured so that one of the two oppos... | 06/16/1998 |
| 5007456 | Closing arrangement for ducts having large cross-sectional areas, particularly flue gas ducts A closing arrangement for ducts having large cross-sectional areas, particularly flue gas ducts for power plants. The arrangement includes at least two flaps which are mounted on at least one flap shaft. Lever arrangements composed of crank arms and tight... | 04/16/1991 |
| 4844120 | Motorized control damper A motorized control damper having at least one damper blade mounted to a drive journaled within a framework. An electric motor is directly connected to one end of the drive shaft on one side of the framework and a return spring connected to the other end ... | 07/04/1989 |
| 4658857 | Control valve with split disc A control valve utilizing the conventional dual wafer check valve, which check valve has a pair of semicircular plates pivotally mounted about a pivot rod at the adjacent straight edge surfaces thereof. The plates are mounted by hinge brackets that allow ... | 04/21/1987 |
| 4541328 | Damper seal apparatus In general, a sealing apparatus for substantially preventing the flow of air through a damper assembly having a plurality of movable vanes includes a first, rigid sealing member having a generally circular cross-section and adapted to be attached to a fir... | 09/17/1985 |
| 4506828 | Reversible damper means Automatic damper means having a multiplicity of damper blades rotatably mounted in housing means to control and regulate the flow of a heating/cooling medium into individual rooms or zones served by a central heating/cooling appliance. The damper blades a... | 03/26/1985 |
| 4304248 | Damper blade operating mechanism An assembly comprising a fluid damper with movable blades which is contained in a duct. On the outside of the duct there is a blade release mechanism. A fusible actuating cartridge is arranged to act on the blade release mechanism to release the blades fr... | 12/08/1981 |
| 4275762 | Control damper A control damper for controlling the flow of air or other gaseous fluid through a duct, comprising a line of blades each of which is so supported for rotation in a surrounding frame that the blades are swingable about parallel axes to open or close an ope... | 06/30/1981 |
| 4241647 | Air damper valve An air damper having a plurality of blades of the opposed blade type is provided wherein such damper provides substantially uniform air flow distribution throughout the flow area of such damper.... | 12/30/1980 |
| 4207864 | Damper The field of this invention is fluid flow control through large conduits. In particular, this invention is contemplated for use in a combined cycle power plant wherein gas turbine exhaust gas is either sent through a heat recovery steam generator (HRSG) o... | 06/17/1980 |
| 4191212 | Multiple blade damper assembly A damper assembly including a plurality of damper blades pivotable about parallel axes. Each blade includes a pair of parallel plates spaced apart by supporting members, the plates providing an open fluid passageway through the blade. When the damper blad... | 03/04/1980 |
| 4076035 | Valve construction A butterfly valve construction is provided and has a valve body comprised of two roughly semicylindrical portions having open ends and such portions have their open ends detachably connected together to define a valve body as a pair of back-to-back roughl... | 02/28/1978 |
